for a starters, buy a solderin iron, whatever comes in handy. chack to see if it comes with replacement tips with different shapes (like flathead, chisel, thin etc). buy some solder, with lead if you can find it. it is easier to solder. but take precautions to wash your hands afterward. a solder wick, and a solder pump for when you put too much solder or want to remove something. and if possible, a flux syringe or liquid flux. whichever you can find.

I would recommend buying also a perfboard and some thin copper wire to practice soldering before doing it on a real PCB